Technical data
6.2. Wood and gasication
It is important that wood gasication boilers worked in specic conditions. Boiler’s temperature
accounts for above 75 °C. At lower temperatures gasication doesn’t procees in a correct way
and what follows - wood intake is relatively higher. Wood drying in a loading chamber is an
essential stage in gasication process - wood doesn’t have adequate temperature at lower
temperatures and all of the process is inadequate. Main warmth source in Orlan boilers is gas
ame arising during gasication, if main conditions according correct burning process aren’t
taken, then both quality and quantity of released gas won’t be sufcient.
Very important are: quality, humidity and kind of burned wood. Hard wood is the best - (beech,
oak, hornbeam etc.) at 15 up to 25 % humidity. Using different kinds of wood, such as pine,
spruce etc. is possible but there will be more burning waste at the sides and it will be necessary to
load the chamber more often. Hygrometer is for humidity measuring - it helps to select wood at
best quality (there is a guideline diagram of wood’s humidity on the next page).
Right quality of wood warranties proper boiler’s working. Using the fuel at different parameters
doesn’t guarantee correct boiler’s operating.
Tab. 4 Wood density diagram
wood type density of just cut wood [kg/m
3
] density of dry wood [kg/m
3
]
coniferous tree
pine 700 480
larch 760 600
spruce 740 430
r 1000 450
deciduous tree
oak 1080 710
elm 950 680
ash 920 750
beech 990 730
hornbeam 1080 830
alder 690 530
birch 650 650
maple 870 660
lime 730 530
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